Art of letter-press printing



c. W'INKLER. ART OF LETTER PRESS PRINTING.

APPLICATION FILED MAR-18,1920.

1,356A20. v Patented Oct. 19,1920.

6/712 M/V/V 5 5 V UNITED STATES PATENT OFFICE.

C. ARL WINKLERfOF BERNE, SWITZERLAND.

.ART OF LETTER-PRESS PRINTING.

Specification of Letters Patent. Patented Oct, 19, 1920.

Application filed March 18, 1920. Serial No. 366,908.

.Berne, in the Swiss Republic, have invented new and useful Improvements in the Art of Letter-Press Printing, of which the followis a specification.

y present invention relates to an improvement in letter-press printing, in which as is well known, the quality and condition of the ink plays an important part, ina smuch as it varies in cohesion, which is eventually of great influence on the adhesive property of the ink. The-drawback thus re sulting is specially conspicuous in printing on art paper, because the combined effect of the strong pressure and great adhesion of the ink causes picking or peeling of the surface, so that small pieces of paper stick to the forms. v

Although many attempts have been made to overcome this drawback, such as, heating the ink duct or inking apparatus or raising.

the temperature in the printing room, no success has been obtained. By the first mentioned methods the dimensions of the parts in question are unfavorably influenced, while the last method produces unhealthy working conditions.

By my invention these difficulties are avoided by heating the form, or the or an carrying same, to a temperature considera 1 above the temperature of the room (30 C. Experience shows that by so doing the adhesion of the ink is decreased, picking of the paper avoided, and a good, uniform transferof the ink to the sheets assured. These advantages assure not only a considerable improvement in the printing itself, but also a valuable increase in the output of the I machine.

The means employed for heating the form, or organ carrying the form, can be of any desired kind. Electricity has been found to be specially suitable for the purpose, because the device required can then be easily attached to the organ carrying the form, no matter whether the latter be curved or flat. The invention can therefore be applied to different kinds of letter-press printing machines.

In order to prevent excessive heat from being transferred from the form to the inln'ng rollers, which are already heated by frietion against, the form, and distributing rolls, and thus to prevent said inking rolls from becoming blunt or soft, they are cooled by Water, or other liquid, caused to pass, either through their core, or through the distributing rollers against which they bear. By this combined heating and cooling action the composition is kept at a temperature at which the ink is transferred with the best results. The combined heating and cooling enables the printing to be carried. out without intervals for cooling the rollers, and, in addition, an economy of ink amounting to 25% is obtained.

On the drawing illustrating my invention by way of example,

The figure is a diagrammatic side elevation of the inking mechanism as used for a cylinder-flat-form printing machine, showing the form-carriage in longitudinal section.

a is the form and b, 6, b the inking rollers, by which the ink is applied to said form. The ink is taken from the ink duct 0 in the usual manner and is transferred by the inking cylinder d, vibrating roller 6 and distributing rollers and cylinders f g, h, i, 70, Z, and m to the inking rollers. The form-carriage n is heated by the electric resistances 0. By a pipe p water is conducted to the interior of the .ink distributing rolls is, Z, which bear against the inkingrolls.

What I claim and desire to secure by Letters Patent of the United States is 2- 1. A letter-press printing machine, comof said inking mechanism, substantially as,

and for the purpose, set forth.

2. A letter-press printing machine, comprising in combination a form carriage adapted to be electrically heated, inking mechanism, and means to circulate a cooling liquid through the ink distributing rolls of said inking mechanism against which the inking rollers bear, substantially as, and for the purpose, set forth.

3. A letter-press printing-machine comprising in combination a form carriage adapted to be electrically heated well above the temperature of the room, inking mechanism, and means to interiorly cool the rollers of said inking mechanism, substantially as, and for the purpose, set forth.

4. A letter-press printing machine, comprising in combination a form carriage,

electrical means to heat said form cerflege name to this specification in the presence to a temperature of about 30 (3., inking of two subscribing Witnesses. mechanism, and means to pass Water through ink distributing rolls of said inking mech- CARL WINKLER' 5 anism, substantially as, and for the purpose, Witnesses:

set forth. M. MULLER,

In testimony whereof I have signed my 0. AURBAGH. 

